/mandos/trunk : revision 626

9

* "browse_callback", and parts of "main".

10

*

11

* Everything else is

12

13

12

13

14

*

15

* This program is free software: you can redistribute it and/or

16

* modify it under the terms of the GNU General Public License as

32

/* Needed by GPGME, specifically gpgme_data_seek() */

33

#ifndef _LARGEFILE_SOURCE

34

#define _LARGEFILE_SOURCE

35

#endif /* not _LARGEFILE_SOURCE */

35

#endif

36

#ifndef _FILE_OFFSET_BITS

37

#define _FILE_OFFSET_BITS 64

38

#endif /* not _FILE_OFFSET_BITS */

38

#endif

39

40

#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */

41

42

#include <stdio.h> /* fprintf(), stderr, fwrite(),

43

stdout, ferror() */

43

stdout, ferror(), remove() */

44

#include <stdint.h> /* uint16_t, uint32_t, intptr_t */

45

#include <stddef.h> /* NULL, size_t, ssize_t */

46

#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),

55

opendir(), DIR */

56

#include <sys/stat.h> /* open(), S_ISREG */

57

#include <sys/socket.h> /* socket(), struct sockaddr_in6,

58

inet_pton(), connect(),

59

getnameinfo() */

60

#include <fcntl.h> /* open(), unlinkat() */

58

inet_pton(), connect() */

59

#include <fcntl.h> /* open() */

61

60

#include <dirent.h> /* opendir(), struct dirent, readdir()

62

61

*/

63

62

#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,

73

72

*/

74

73

#include <unistd.h> /* close(), SEEK_SET, off_t, write(),

75

74

getuid(), getgid(), seteuid(),

76

setgid(), pause(), _exit(),

77

unlinkat() */

78

#include <arpa/inet.h> /* inet_pton(), htons() */

75

setgid(), pause(), _exit() */

76

#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */

79

77

#include <iso646.h> /* not, or, and */

80

78

#include <argp.h> /* struct argp_option, error_t, struct

81

79

argp_state, struct argp,

93

91

argz_delete(), argz_append(),

94

92

argz_stringify(), argz_add(),

95

93

argz_count() */

96

#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,

97

EAI_SYSTEM, gai_strerror() */

98

94

99

95

#ifdef __linux__

100

96

#include <sys/klog.h> /* klogctl() */

142

138

static const char sys_class_net[] = "/sys/class/net";

143

139

char *connect_to = NULL;

144

140

const char *hookdir = HOOKDIR;

145

int hookdir_fd = -1;

146

141

uid_t uid = 65534;

147

142

gid_t gid = 65534;

148

143

185

180

perror(print_text);

186

181

}

187

182

188

__attribute__((format (gnu_printf, 2, 3), nonnull))

183

__attribute__((format (gnu_printf, 2, 3)))

189

184

int fprintf_plus(FILE *stream, const char *format, ...){

190

185

va_list ap;

191

186

va_start (ap, format);

200

195

* bytes. "buffer_capacity" is how much is currently allocated,

201

196

* "buffer_length" is how much is already used.

202

197

*/

203

__attribute__((nonnull, warn_unused_result))

204

198

size_t incbuffer(char **buffer, size_t buffer_length,

205

199

size_t buffer_capacity){

206

200

if(buffer_length + BUFFER_SIZE > buffer_capacity){

207

char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);

208

if(new_buf == NULL){

209

int old_errno = errno;

210

free(*buffer);

211

errno = old_errno;

212

*buffer = NULL;

201

*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);

202

if(buffer == NULL){

213

203

return 0;

214

204

}

215

*buffer = new_buf;

216

205

buffer_capacity += BUFFER_SIZE;

217

206

}

218

207

return buffer_capacity;

219

208

}

220

209

221

210

/* Add server to set of servers to retry periodically */

222

__attribute__((nonnull, warn_unused_result))

223

211

bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,

224

212

int af, server **current_server){

225

213

int ret;

234

222

.af = af };

235

223

if(new_server->ip == NULL){

236

224

perror_plus("strdup");

237

free(new_server);

238

return false;

239

}

240

ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));

241

if(ret == -1){

242

perror_plus("clock_gettime");

243

#ifdef __GNUC__

244

#pragma GCC diagnostic push

245

#pragma GCC diagnostic ignored "-Wcast-qual"

246

#endif

247

free((char *)(new_server->ip));

248

#ifdef __GNUC__

249

#pragma GCC diagnostic pop

250

#endif

251

free(new_server);

252

225

return false;

253

226

}

254

227

/* Special case of first server */

256

229

new_server->next = new_server;

257

230

new_server->prev = new_server;

258

231

*current_server = new_server;

232

/* Place the new server last in the list */

259

233

} else {

260

/* Place the new server last in the list */

261

234

new_server->next = *current_server;

262

235

new_server->prev = (*current_server)->prev;

263

236

new_server->prev->next = new_server;

264

237

(*current_server)->prev = new_server;

265

238

}

239

ret = clock_gettime(CLOCK_MONOTONIC, &(*current_server)->last_seen);

240

if(ret == -1){

241

perror_plus("clock_gettime");

242

return false;

243

}

266

244

return true;

267

245

}

268

246

269

247

/*

270

248

* Initialize GPGME.

271

249

*/

272

__attribute__((nonnull, warn_unused_result))

273

static bool init_gpgme(const char * const seckey,

274

const char * const pubkey,

275

const char * const tempdir,

276

mandos_context *mc){

250

static bool init_gpgme(const char *seckey, const char *pubkey,

251

const char *tempdir, mandos_context *mc){

277

252

gpgme_error_t rc;

278

253

gpgme_engine_info_t engine_info;

279

254

280

255

/*

281

256

* Helper function to insert pub and seckey to the engine keyring.

282

257

*/

283

bool import_key(const char * const filename){

258

bool import_key(const char *filename){

284

259

int ret;

285

260

int fd;

286

261

gpgme_data_t pgp_data;

367

342

* Decrypt OpenPGP data.

368

343

* Returns -1 on error

369

344

*/

370

__attribute__((nonnull, warn_unused_result))

371

345

static ssize_t pgp_packet_decrypt(const char *cryptotext,

372

346

size_t crypto_size,

373

347

char **plaintext,

493

467

return plaintext_length;

494

468

}

495

469

496

__attribute__((warn_unused_result, const))

497

static const char *safe_string(const char *str){

498

if(str == NULL)

499

return "(unknown)";

500

return str;

501

}

502

503

__attribute__((warn_unused_result))

504

static const char *safer_gnutls_strerror(int value){

470

static const char * safer_gnutls_strerror(int value){

505

471

const char *ret = gnutls_strerror(value);

506

return safe_string(ret);

472

if(ret == NULL)

473

ret = "(unknown)";

474

return ret;

507

475

}

508

476

509

477

/* GnuTLS log function callback */

510

__attribute__((nonnull))

511

478

static void debuggnutls(__attribute__((unused)) int level,

512

479

const char* string){

513

480

fprintf_plus(stderr, "GnuTLS: %s", string);

514

481

}

515

482

516

__attribute__((nonnull, warn_unused_result))

517

483

static int init_gnutls_global(const char *pubkeyfilename,

518

484

const char *seckeyfilename,

519

485

mandos_context *mc){

520

486

int ret;

521

unsigned int uret;

522

487

523

488

if(debug){

524

489

fprintf_plus(stderr, "Initializing GnuTLS\n");

575

540

safer_gnutls_strerror(ret));

576

541

goto globalfail;

577

542

}

578

if(mc->dh_bits == 0){

579

/* Find out the optimal number of DH bits */

580

/* Try to read the private key file */

581

gnutls_datum_t buffer = { .data = NULL, .size = 0 };

582

{

583

int secfile = open(seckeyfilename, O_RDONLY);

584

size_t buffer_capacity = 0;

585

while(true){

586

buffer_capacity = incbuffer((char **)&buffer.data,

587

(size_t)buffer.size,

588

(size_t)buffer_capacity);

589

if(buffer_capacity == 0){

590

perror_plus("incbuffer");

591

free(buffer.data);

592

buffer.data = NULL;

593

break;

594

}

595

ssize_t bytes_read = read(secfile, buffer.data + buffer.size,

596

BUFFER_SIZE);

597

/* EOF */

598

if(bytes_read == 0){

599

break;

600

}

601

/* check bytes_read for failure */

602

if(bytes_read < 0){

603

perror_plus("read");

604

free(buffer.data);

605

buffer.data = NULL;

606

break;

607

}

608

buffer.size += (unsigned int)bytes_read;

609

}

610

close(secfile);

611

}

612

/* If successful, use buffer to parse private key */

613

gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;

614

if(buffer.data != NULL){

615

{

616

gnutls_openpgp_privkey_t privkey = NULL;

617

ret = gnutls_openpgp_privkey_init(&privkey);

618

if(ret != GNUTLS_E_SUCCESS){

619

fprintf_plus(stderr, "Error initializing OpenPGP key"

620

" structure: %s", safer_gnutls_strerror(ret));

621

free(buffer.data);

622

buffer.data = NULL;

623

} else {

624

ret = gnutls_openpgp_privkey_import(privkey, &buffer,

625

GNUTLS_OPENPGP_FMT_BASE64,

626

"", 0);

627

if(ret != GNUTLS_E_SUCCESS){

628

fprintf_plus(stderr, "Error importing OpenPGP key : %s",

629

safer_gnutls_strerror(ret));

630

privkey = NULL;

631

}

632

free(buffer.data);

633

buffer.data = NULL;

634

if(privkey != NULL){

635

/* Use private key to suggest an appropriate sec_param */

636

sec_param = gnutls_openpgp_privkey_sec_param(privkey);

637

gnutls_openpgp_privkey_deinit(privkey);

638

if(debug){

639

fprintf_plus(stderr, "This OpenPGP key implies using a"

640

" GnuTLS security parameter \"%s\".\n",

641

safe_string(gnutls_sec_param_get_name

642

(sec_param)));

643

}

644

}

645

}

646

}

647

if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){

648

/* Err on the side of caution */

649

sec_param = GNUTLS_SEC_PARAM_ULTRA;

650

if(debug){

651

fprintf_plus(stderr, "Falling back to security parameter"

652

" \"%s\"\n",

653

safe_string(gnutls_sec_param_get_name

654

(sec_param)));

655

}

656

}

657

}

658

uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);

659

if(uret != 0){

660

mc->dh_bits = uret;

661

if(debug){

662

fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"

663

" implies %u DH bits; using that.\n",

664

safe_string(gnutls_sec_param_get_name

665

(sec_param)),

666

mc->dh_bits);

667

}

668

} else {

669

fprintf_plus(stderr, "Failed to get implied number of DH"

670

" bits for security parameter \"%s\"): %s\n",

671

safe_string(gnutls_sec_param_get_name(sec_param)),

672

safer_gnutls_strerror(ret));

673

goto globalfail;

674

}

675

} else if(debug){

676

fprintf_plus(stderr, "DH bits explicitly set to %u\n",

677

mc->dh_bits);

678

}

679

543

ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);

680

544

if(ret != GNUTLS_E_SUCCESS){

681

fprintf_plus(stderr, "Error in GnuTLS prime generation (%u bits):"

682

" %s\n", mc->dh_bits, safer_gnutls_strerror(ret));

545

fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",

546

safer_gnutls_strerror(ret));

683

547

goto globalfail;

684

548

}

685

549

695

559

return -1;

696

560

}

697

561

698

__attribute__((nonnull, warn_unused_result))

699

562

static int init_gnutls_session(gnutls_session_t *session,

700

563

mandos_context *mc){

701

564

int ret;

758

621

__attribute__((unused)) const char *txt){}

759

622

760

623

/* Called when a Mandos server is found */

761

__attribute__((nonnull, warn_unused_result))

762

624

static int start_mandos_communication(const char *ip, in_port_t port,

763

625

AvahiIfIndex if_index,

764

626

int af, mandos_context *mc){

765

627

int ret, tcp_sd = -1;

766

628

ssize_t sret;

767

struct sockaddr_storage to;

629

union {

630

struct sockaddr_in in;

631

struct sockaddr_in6 in6;

632

} to;

768

633

char *buffer = NULL;

769

634

char *decrypted_buffer = NULL;

770

635

size_t buffer_length = 0;

851

716

852

717

memset(&to, 0, sizeof(to));

853

718

if(af == AF_INET6){

854

((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;

855

ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);

719

to.in6.sin6_family = (sa_family_t)af;

720

ret = inet_pton(af, ip, &to.in6.sin6_addr);

856

721

} else { /* IPv4 */

857

((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;

858

ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);

722

to.in.sin_family = (sa_family_t)af;

723

ret = inet_pton(af, ip, &to.in.sin_addr);

859

724

}

860

725

if(ret < 0 ){

861

726

int e = errno;

870

735

goto mandos_end;

871

736

}

872

737

if(af == AF_INET6){

873

((struct sockaddr_in6 *)&to)->sin6_port = htons(port);

874

if(IN6_IS_ADDR_LINKLOCAL

875

(&((struct sockaddr_in6 *)&to)->sin6_addr)){

738

to.in6.sin6_port = htons(port);

739

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

740

(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and

741

-Wunreachable-code*/

876

742

if(if_index == AVAHI_IF_UNSPEC){

877

743

fprintf_plus(stderr, "An IPv6 link-local address is"

878

744

" incomplete without a network interface\n");

880

746

goto mandos_end;

881

747

}

882

748

/* Set the network interface number as scope */

883

((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;

749

to.in6.sin6_scope_id = (uint32_t)if_index;

884

750

}

885

751

} else {

886

((struct sockaddr_in *)&to)->sin_port = htons(port);

752

to.in.sin_port = htons(port); /* Spurious warnings from

753

-Wconversion and

754

-Wunreachable-code */

887

755

}

888

756

889

757

if(quit_now){

906

774

}

907

775

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

908

776

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

777

const char *pcret;

909

778

if(af == AF_INET6){

910

ret = getnameinfo((struct sockaddr *)&to,

911

sizeof(struct sockaddr_in6),

912

addrstr, sizeof(addrstr), NULL, 0,

913

NI_NUMERICHOST);

779

pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,

780

sizeof(addrstr));

914

781

} else {

915

ret = getnameinfo((struct sockaddr *)&to,

916

sizeof(struct sockaddr_in),

917

addrstr, sizeof(addrstr), NULL, 0,

918

NI_NUMERICHOST);

782

pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,

783

sizeof(addrstr));

919

784

}

920

if(ret == EAI_SYSTEM){

921

perror_plus("getnameinfo");

922

} else if(ret != 0) {

923

fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));

924

} else if(strcmp(addrstr, ip) != 0){

925

fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);

785

if(pcret == NULL){

786

perror_plus("inet_ntop");

787

} else {

788

if(strcmp(addrstr, ip) != 0){

789

fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);

790

}

926

791

}

927

792

}

928

793

932

797

}

933

798

934

799

if(af == AF_INET6){

935

ret = connect(tcp_sd, (struct sockaddr *)&to,

936

sizeof(struct sockaddr_in6));

800

ret = connect(tcp_sd, &to.in6, sizeof(to));

937

801

} else {

938

ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */

939

sizeof(struct sockaddr_in));

802

ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */

940

803

}

941

804

if(ret < 0){

942

if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){

805

if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){

943

806

int e = errno;

944

807

perror_plus("connect");

945

808

errno = e;

1160

1023

return retval;

1161

1024

}

1162

1025

1163

__attribute__((nonnull))

1164

1026

static void resolve_callback(AvahiSServiceResolver *r,

1165

1027

AvahiIfIndex interface,

1166

1028

AvahiProtocol proto,

1174

1036

AVAHI_GCC_UNUSED AvahiStringList *txt,

1175

1037

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1176

1038

flags,

1177

void *mc){

1039

void* mc){

1178

1040

if(r == NULL){

1179

1041

return;

1180

1042

}

1183

1045

timed out */

1184

1046

1185

1047

if(quit_now){

1186

avahi_s_service_resolver_free(r);

1187

1048

return;

1188

1049

}

1189

1050

1234

1095

const char *domain,

1235

1096

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1236

1097

flags,

1237

void *mc){

1098

void* mc){

1238

1099

if(b == NULL){

1239

1100

return;

1240

1101

}

1300

1161

errno = old_errno;

1301

1162

}

1302

1163

1303

__attribute__((nonnull, warn_unused_result))

1304

1164

bool get_flags(const char *ifname, struct ifreq *ifr){

1305

1165

int ret;

1306

1166

error_t ret_errno;

1325

1185

return true;

1326

1186

}

1327

1187

1328

__attribute__((nonnull, warn_unused_result))

1329

1188

bool good_flags(const char *ifname, const struct ifreq *ifr){

1330

1189

1331

1190

/* Reject the loopback device */

1373

1232

* corresponds to an acceptable network device.

1374

1233

* (This function is passed to scandir(3) as a filter function.)

1375

1234

*/

1376

__attribute__((nonnull, warn_unused_result))

1377

1235

int good_interface(const struct dirent *if_entry){

1378

1236

if(if_entry->d_name[0] == '.'){

1379

1237

return 0;

1397

1255

/*

1398

1256

* This function determines if a network interface is up.

1399

1257

*/

1400

__attribute__((nonnull, warn_unused_result))

1401

1258

bool interface_is_up(const char *interface){

1402

1259

struct ifreq ifr;

1403

1260

if(not get_flags(interface, &ifr)){

1414

1271

/*

1415

1272

* This function determines if a network interface is running

1416

1273

*/

1417

__attribute__((nonnull, warn_unused_result))

1418

1274

bool interface_is_running(const char *interface){

1419

1275

struct ifreq ifr;

1420

1276

if(not get_flags(interface, &ifr)){

1428

1284

return (bool)(ifr.ifr_flags & IFF_RUNNING);

1429

1285

}

1430

1286

1431

__attribute__((nonnull, pure, warn_unused_result))

1432

1287

int notdotentries(const struct dirent *direntry){

1433

1288

/* Skip "." and ".." */

1434

1289

if(direntry->d_name[0] == '.'

1441

1296

}

1442

1297

1443

1298

/* Is this directory entry a runnable program? */

1444

__attribute__((nonnull, warn_unused_result))

1445

1299

int runnable_hook(const struct dirent *direntry){

1446

1300

int ret;

1447

1301

size_t sret;

1455

1309

sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"

1456

1310

"abcdefghijklmnopqrstuvwxyz"

1457

1311

"0123456789"

1458

"_.-");

1312

"_-");

1459

1313

if((direntry->d_name)[sret] != '\0'){

1460

1314

/* Contains non-allowed characters */

1461

1315

if(debug){

1465

1319

return 0;

1466

1320

}

1467

1321

1468

ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);

1322

char *fullname = NULL;

1323

ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);

1324

if(ret < 0){

1325

perror_plus("asprintf");

1326

return 0;

1327

}

1328

1329

ret = stat(fullname, &st);

1469

1330

if(ret == -1){

1470

1331

if(debug){

1471

1332

perror_plus("Could not stat hook");

1495

1356

return 1;

1496

1357

}

1497

1358

1498

__attribute__((nonnull, warn_unused_result))

1499

1359

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1500

1360

mandos_context *mc){

1501

1361

int ret;

1505

1365

1506

1366

while(true){

1507

1367

if(mc->current_server == NULL){

1508

if(debug){

1368

if (debug){

1509

1369

fprintf_plus(stderr, "Wait until first server is found."

1510

1370

" No timeout!\n");

1511

1371

}

1512

1372

ret = avahi_simple_poll_iterate(s, -1);

1513

1373

} else {

1514

if(debug){

1374

if (debug){

1515

1375

fprintf_plus(stderr, "Check current_server if we should run"

1516

1376

" it, or wait\n");

1517

1377

}

1534

1394

- ((intmax_t)waited_time.tv_sec * 1000))

1535

1395

- ((intmax_t)waited_time.tv_nsec / 1000000));

1536

1396

1537

if(debug){

1397

if (debug){

1538

1398

fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",

1539

1399

block_time);

1540

1400

}

1562

1422

ret = avahi_simple_poll_iterate(s, (int)block_time);

1563

1423

}

1564

1424

if(ret != 0){

1565

if(ret > 0 or errno != EINTR){

1425

if (ret > 0 or errno != EINTR){

1566

1426

return (ret != 1) ? ret : 0;

1567

1427

}

1568

1428

}

1570

1430

}

1571

1431

1572

1432

/* Set effective uid to 0, return errno */

1573

__attribute__((warn_unused_result))

1574

1433

error_t raise_privileges(void){

1575

1434

error_t old_errno = errno;

1576

1435

error_t ret_errno = 0;

1577

1436

if(seteuid(0) == -1){

1578

1437

ret_errno = errno;

1438

perror_plus("seteuid");

1579

1439

}

1580

1440

errno = old_errno;

1581

1441

return ret_errno;

1582

1442

}

1583

1443

1584

1444

/* Set effective and real user ID to 0. Return errno. */

1585

__attribute__((warn_unused_result))

1586

1445

error_t raise_privileges_permanently(void){

1587

1446

error_t old_errno = errno;

1588

1447

error_t ret_errno = raise_privileges();

1592

1451

}

1593

1452

if(setuid(0) == -1){

1594

1453

ret_errno = errno;

1454

perror_plus("seteuid");

1595

1455

}

1596

1456

errno = old_errno;

1597

1457

return ret_errno;

1598

1458

}

1599

1459

1600

1460

/* Set effective user ID to unprivileged saved user ID */

1601

__attribute__((warn_unused_result))

1602

1461

error_t lower_privileges(void){

1603

1462

error_t old_errno = errno;

1604

1463

error_t ret_errno = 0;

1605

1464

if(seteuid(uid) == -1){

1606

1465

ret_errno = errno;

1466

perror_plus("seteuid");

1607

1467

}

1608

1468

errno = old_errno;

1609

1469

return ret_errno;

1610

1470

}

1611

1471

1612

1472

/* Lower privileges permanently */

1613

__attribute__((warn_unused_result))

1614

1473

error_t lower_privileges_permanently(void){

1615

1474

error_t old_errno = errno;

1616

1475

error_t ret_errno = 0;

1617

1476

if(setuid(uid) == -1){

1618

1477

ret_errno = errno;

1478

perror_plus("setuid");

1619

1479

}

1620

1480

errno = old_errno;

1621

1481

return ret_errno;

1622

1482

}

1623

1483

1624

__attribute__((nonnull))

1625

void run_network_hooks(const char *mode, const char *interface,

1484

bool run_network_hooks(const char *mode, const char *interface,

1626

1485

const float delay){

1627

struct dirent **direntries = NULL;

1628

if(hookdir_fd == -1){

1629

hookdir_fd = open(hookdir, O_RDONLY);

1630

if(hookdir_fd == -1){

1631

if(errno == ENOENT){

1632

if(debug){

1633

fprintf_plus(stderr, "Network hook directory \"%s\" not"

1634

" found\n", hookdir);

1635

}

1636

} else {

1637

perror_plus("open");

1638

}

1639

return;

1640

}

1641

}

1642

#ifdef __GLIBC__

1643

#if __GLIBC_PREREQ(2, 15)

1644

int numhooks = scandirat(hookdir_fd, ".", &direntries,

1645

runnable_hook, alphasort);

1646

#else /* not __GLIBC_PREREQ(2, 15) */

1647

int numhooks = scandir(hookdir, &direntries, runnable_hook,

1648

alphasort);

1649

#endif /* not __GLIBC_PREREQ(2, 15) */

1650

#else /* not __GLIBC__ */

1651

int numhooks = scandir(hookdir, &direntries, runnable_hook,

1652

alphasort);

1653

#endif /* not __GLIBC__ */

1486

struct dirent **direntries;

1487

struct dirent *direntry;

1488

int ret;

1489

int numhooks = scandir(hookdir, &direntries, runnable_hook,

1490

alphasort);

1654

1491

if(numhooks == -1){

1655

perror_plus("scandir");

1656

return;

1657

}

1658

struct dirent *direntry;

1659

int ret;

1660

int devnull = open("/dev/null", O_RDONLY);

1661

for(int i = 0; i < numhooks; i++){

1662

direntry = direntries[i];

1663

if(debug){

1664

fprintf_plus(stderr, "Running network hook \"%s\"\n",

1665

direntry->d_name);

1492

if(errno == ENOENT){

1493

if(debug){

1494

fprintf_plus(stderr, "Network hook directory \"%s\" not"

1495

" found\n", hookdir);

1496

}

1497

} else {

1498

perror_plus("scandir");

1666

1499

}

1667

pid_t hook_pid = fork();

1668

if(hook_pid == 0){

1669

/* Child */

1670

/* Raise privileges */

1671

errno = raise_privileges_permanently();

1672

if(errno != 0){

1673

perror_plus("Failed to raise privileges");

1674

_exit(EX_NOPERM);

1675

}

1676

/* Set group */

1677

errno = 0;

1678

ret = setgid(0);

1679

if(ret == -1){

1680

perror_plus("setgid");

1681

_exit(EX_NOPERM);

1682

}

1683

/* Reset supplementary groups */

1684

errno = 0;

1685

ret = setgroups(0, NULL);

1686

if(ret == -1){

1687

perror_plus("setgroups");

1688

_exit(EX_NOPERM);

1689

}

1690

ret = dup2(devnull, STDIN_FILENO);

1691

if(ret == -1){

1692

perror_plus("dup2(devnull, STDIN_FILENO)");

1693

_exit(EX_OSERR);

1694

}

1695

ret = close(devnull);

1696

if(ret == -1){

1697

perror_plus("close");

1698

_exit(EX_OSERR);

1699

}

1700

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1701

if(ret == -1){

1702

perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");

1703

_exit(EX_OSERR);

1704

}

1705

ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);

1706

if(ret == -1){

1707

perror_plus("setenv");

1708

_exit(EX_OSERR);

1709

}

1710

ret = setenv("DEVICE", interface, 1);

1711

if(ret == -1){

1712

perror_plus("setenv");

1713

_exit(EX_OSERR);

1714

}

1715

ret = setenv("VERBOSITY", debug ? "1" : "0", 1);

1716

if(ret == -1){

1717

perror_plus("setenv");

1718

_exit(EX_OSERR);

1719

}

1720

ret = setenv("MODE", mode, 1);

1721

if(ret == -1){

1722

perror_plus("setenv");

1723

_exit(EX_OSERR);

1724

}

1725

char *delaystring;

1726

ret = asprintf(&delaystring, "%f", (double)delay);

1727

if(ret == -1){

1500

} else {

1501

int devnull = open("/dev/null", O_RDONLY);

1502

for(int i = 0; i < numhooks; i++){

1503

direntry = direntries[i];

1504

char *fullname = NULL;

1505

ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);

1506

if(ret < 0){

1728

1507

perror_plus("asprintf");

1729

_exit(EX_OSERR);

1730

}

1731

ret = setenv("DELAY", delaystring, 1);

1732

if(ret == -1){

1508

continue;

1509

}

1510

if(debug){

1511

fprintf_plus(stderr, "Running network hook \"%s\"\n",

1512

direntry->d_name);

1513

}

1514

pid_t hook_pid = fork();

1515

if(hook_pid == 0){

1516

/* Child */

1517

/* Raise privileges */

1518

raise_privileges_permanently();

1519

/* Set group */

1520

errno = 0;

1521

ret = setgid(0);

1522

if(ret == -1){

1523

perror_plus("setgid");

1524

}

1525

/* Reset supplementary groups */

1526

errno = 0;

1527

ret = setgroups(0, NULL);

1528

if(ret == -1){

1529

perror_plus("setgroups");

1530

}

1531

dup2(devnull, STDIN_FILENO);

1532

close(devnull);

1533

dup2(STDERR_FILENO, STDOUT_FILENO);

1534

ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);

1535

if(ret == -1){

1536

perror_plus("setenv");

1537

_exit(EX_OSERR);

1538

}

1539

ret = setenv("DEVICE", interface, 1);

1540

if(ret == -1){

1541

perror_plus("setenv");

1542

_exit(EX_OSERR);

1543

}

1544

ret = setenv("VERBOSITY", debug ? "1" : "0", 1);

1545

if(ret == -1){

1546

perror_plus("setenv");

1547

_exit(EX_OSERR);

1548

}

1549

ret = setenv("MODE", mode, 1);

1550

if(ret == -1){

1551

perror_plus("setenv");

1552

_exit(EX_OSERR);

1553

}

1554

char *delaystring;

1555

ret = asprintf(&delaystring, "%f", delay);

1556

if(ret == -1){

1557

perror_plus("asprintf");

1558

_exit(EX_OSERR);

1559

}

1560

ret = setenv("DELAY", delaystring, 1);

1561

if(ret == -1){

1562

free(delaystring);

1563

perror_plus("setenv");

1564

_exit(EX_OSERR);

1565

}

1733

1566

free(delaystring);

1734

perror_plus("setenv");

1735

_exit(EX_OSERR);

1736

}

1737

free(delaystring);

1738

if(connect_to != NULL){

1739

ret = setenv("CONNECT", connect_to, 1);

1740

if(ret == -1){

1741

perror_plus("setenv");

1742

_exit(EX_OSERR);

1743

}

1744

}

1745

int hook_fd = openat(hookdir_fd, direntry->d_name, O_RDONLY);

1746

if(hook_fd == -1){

1747

perror_plus("openat");

1748

_exit(EXIT_FAILURE);

1749

}

1750

if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){

1751

perror_plus("close");

1752

_exit(EXIT_FAILURE);

1753

}

1754

if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },

1755

environ) == -1){

1756

perror_plus("fexecve");

1757

_exit(EXIT_FAILURE);

1758

}

1759

} else {

1760

if(hook_pid == -1){

1761

perror_plus("fork");

1762

free(direntry);

1763

continue;

1764

}

1765

int status;

1766

if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){

1767

perror_plus("waitpid");

1768

free(direntry);

1769

continue;

1770

}

1771

if(WIFEXITED(status)){

1772

if(WEXITSTATUS(status) != 0){

1773

fprintf_plus(stderr, "Warning: network hook \"%s\" exited"

1774

" with status %d\n", direntry->d_name,

1775

WEXITSTATUS(status));

1776

free(direntry);

1777

continue;

1778

}

1779

} else if(WIFSIGNALED(status)){

1780

fprintf_plus(stderr, "Warning: network hook \"%s\" died by"

1781

" signal %d\n", direntry->d_name,

1782

WTERMSIG(status));

1783

free(direntry);

1784

continue;

1567

if(connect_to != NULL){

1568

ret = setenv("CONNECT", connect_to, 1);

1569

if(ret == -1){

1570

perror_plus("setenv");

1571

_exit(EX_OSERR);

1572

}

1573

}

1574

if(execl(fullname, direntry->d_name, mode, NULL) == -1){

1575

perror_plus("execl");

1576

_exit(EXIT_FAILURE);

1577

}

1785

1578

} else {

1786

fprintf_plus(stderr, "Warning: network hook \"%s\""

1787

" crashed\n", direntry->d_name);

1788

free(direntry);

1789

continue;

1790

}

1791

}

1792

if(debug){

1793

fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",

1794

direntry->d_name);

1795

}

1796

free(direntry);

1797

}

1798

free(direntries);

1799

if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){

1800

perror_plus("close");

1801

} else {

1802

hookdir_fd = -1;

1803

}

1804

close(devnull);

1579

int status;

1580

if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){

1581

perror_plus("waitpid");

1582

free(fullname);

1583

continue;

1584

}

1585

if(WIFEXITED(status)){

1586

if(WEXITSTATUS(status) != 0){

1587

fprintf_plus(stderr, "Warning: network hook \"%s\" exited"

1588

" with status %d\n", direntry->d_name,

1589

WEXITSTATUS(status));

1590

free(fullname);

1591

continue;

1592

}

1593

} else if(WIFSIGNALED(status)){

1594

fprintf_plus(stderr, "Warning: network hook \"%s\" died by"

1595

" signal %d\n", direntry->d_name,

1596

WTERMSIG(status));

1597

free(fullname);

1598

continue;

1599

} else {

1600

fprintf_plus(stderr, "Warning: network hook \"%s\""

1601

" crashed\n", direntry->d_name);

1602

free(fullname);

1603

continue;

1604

}

1605

}

1606

free(fullname);

1607

if(debug){

1608

fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",

1609

direntry->d_name);

1610

}

1611

}

1612

close(devnull);

1613

}

1614

return true;

1805

1615

}

1806

1616

1807

__attribute__((nonnull, warn_unused_result))

1808

1617

error_t bring_up_interface(const char *const interface,

1809

1618

const float delay){

1619

int sd = -1;

1810

1620

error_t old_errno = errno;

1811

int ret;

1621

error_t ret_errno = 0;

1622

int ret, ret_setflags;

1812

1623

struct ifreq network;

1813

1624

unsigned int if_index = if_nametoindex(interface);

1814

1625

if(if_index == 0){

1823

1634

}

1824

1635

1825

1636

if(not interface_is_up(interface)){

1826

error_t ret_errno = 0, ioctl_errno = 0;

1827

if(not get_flags(interface, &network)){

1637

if(not get_flags(interface, &network) and debug){

1828

1638

ret_errno = errno;

1829

1639

fprintf_plus(stderr, "Failed to get flags for interface "

1830

1640

"\"%s\"\n", interface);

1831

errno = old_errno;

1832

1641

return ret_errno;

1833

1642

}

1834

network.ifr_flags |= IFF_UP; /* set flag */

1643

network.ifr_flags |= IFF_UP;

1835

1644

1836

int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1837

if(sd == -1){

1645

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1646

if(sd < 0){

1838

1647

ret_errno = errno;

1839

1648

perror_plus("socket");

1840

1649

errno = old_errno;

1841

1650

return ret_errno;

1842

1651

}

1843

1652

1844

1653

if(quit_now){

1845

ret = (int)TEMP_FAILURE_RETRY(close(sd));

1846

if(ret == -1){

1847

perror_plus("close");

1848

}

1654

close(sd);

1849

1655

errno = old_errno;

1850

1656

return EINTR;

1851

1657

}

1855

1661

interface);

1856

1662

}

1857

1663

1858

/* Raise privileges */

1859

ret_errno = raise_privileges();

1860

if(ret_errno != 0){

1861

errno = ret_errno;

1862

perror_plus("Failed to raise privileges");

1863

}

1664

/* Raise priviliges */

1665

raise_privileges();

1864

1666

1865

1667

#ifdef __linux__

1866

int ret_linux;

1867

bool restore_loglevel = false;

1868

if(ret_errno == 0){

1869

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1870

messages about the network interface to mess up the prompt */

1871

ret_linux = klogctl(8, NULL, 5);

1872

if(ret_linux == -1){

1873

perror_plus("klogctl");

1874

} else {

1875

restore_loglevel = true;

1876

}

1668

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1669

messages about the network interface to mess up the prompt */

1670

int ret_linux = klogctl(8, NULL, 5);

1671

bool restore_loglevel = true;

1672

if(ret_linux == -1){

1673

restore_loglevel = false;

1674

perror_plus("klogctl");

1877

1675

}

1878

1676

#endif /* __linux__ */

1879

int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);

1880

ioctl_errno = errno;

1677

ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);

1678

ret_errno = errno;

1881

1679

#ifdef __linux__

1882

1680

if(restore_loglevel){

1883

1681

ret_linux = klogctl(7, NULL, 0);

1887

1685

}

1888

1686

#endif /* __linux__ */

1889

1687

1890

/* If raise_privileges() succeeded above */

1891

if(ret_errno == 0){

1892

/* Lower privileges */

1893

ret_errno = lower_privileges();

1894

if(ret_errno != 0){

1895

errno = ret_errno;

1896

perror_plus("Failed to lower privileges");

1897

}

1898

}

1688

/* Lower privileges */

1689

lower_privileges();

1899

1690

1900

1691

/* Close the socket */

1901

1692

ret = (int)TEMP_FAILURE_RETRY(close(sd));

1904

1695

}

1905

1696

1906

1697

if(ret_setflags == -1){

1907

errno = ioctl_errno;

1698

errno = ret_errno;

1908

1699

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1909

1700

errno = old_errno;

1910

return ioctl_errno;

1701

return ret_errno;

1911

1702

}

1912

1703

} else if(debug){

1913

1704

fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",

1931

1722

return 0;

1932

1723

}

1933

1724

1934

__attribute__((nonnull, warn_unused_result))

1935

1725

error_t take_down_interface(const char *const interface){

1726

int sd = -1;

1936

1727

error_t old_errno = errno;

1728

error_t ret_errno = 0;

1729

int ret, ret_setflags;

1937

1730

struct ifreq network;

1938

1731

unsigned int if_index = if_nametoindex(interface);

1939

1732

if(if_index == 0){

1942

1735

return ENXIO;

1943

1736

}

1944

1737

if(interface_is_up(interface)){

1945

error_t ret_errno = 0, ioctl_errno = 0;

1946

1738

if(not get_flags(interface, &network) and debug){

1947

1739

ret_errno = errno;

1948

1740

fprintf_plus(stderr, "Failed to get flags for interface "

1949

1741

"\"%s\"\n", interface);

1950

errno = old_errno;

1951

1742

return ret_errno;

1952

1743

}

1953

1744

network.ifr_flags &= ~(short)IFF_UP; /* clear flag */

1954

1745

1955

int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1956

if(sd == -1){

1746

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1747

if(sd < 0){

1957

1748

ret_errno = errno;

1958

1749

perror_plus("socket");

1959

1750

errno = old_errno;

1965

1756

interface);

1966

1757

}

1967

1758

1968

/* Raise privileges */

1969

ret_errno = raise_privileges();

1970

if(ret_errno != 0){

1971

errno = ret_errno;

1972

perror_plus("Failed to raise privileges");

1973

}

1974

1975

int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);

1976

ioctl_errno = errno;

1977

1978

/* If raise_privileges() succeeded above */

1979

if(ret_errno == 0){

1980

/* Lower privileges */

1981

ret_errno = lower_privileges();

1982

if(ret_errno != 0){

1983

errno = ret_errno;

1984

perror_plus("Failed to lower privileges");

1985

}

1986

}

1759

/* Raise priviliges */

1760

raise_privileges();

1761

1762

ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);

1763

ret_errno = errno;

1764

1765

/* Lower privileges */

1766

lower_privileges();

1987

1767

1988

1768

/* Close the socket */

1989

int ret = (int)TEMP_FAILURE_RETRY(close(sd));

1769

ret = (int)TEMP_FAILURE_RETRY(close(sd));

1990

1770

if(ret == -1){

1991

1771

perror_plus("close");

1992

1772

}

1993

1773

1994

1774

if(ret_setflags == -1){

1995

errno = ioctl_errno;

1775

errno = ret_errno;

1996

1776

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1997

1777

errno = old_errno;

1998

return ioctl_errno;

1778

return ret_errno;

1999

1779

}

2000

1780

} else if(debug){

2001

1781

fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",

2007

1787

}

2008

1788

2009

1789

int main(int argc, char *argv[]){

2010

mandos_context mc = { .server = NULL, .dh_bits = 0,

1790

mandos_context mc = { .server = NULL, .dh_bits = 1024,

2011

1791

.priority = "SECURE256:!CTYPE-X.509:"

2012

"+CTYPE-OPENPGP:!RSA", .current_server = NULL,

1792

"+CTYPE-OPENPGP", .current_server = NULL,

2013

1793

.interfaces = NULL, .interfaces_size = 0 };

2014

1794

AvahiSServiceBrowser *sb = NULL;

2015

1795

error_t ret_errno;

2019

1799

int exitcode = EXIT_SUCCESS;

2020

1800

char *interfaces_to_take_down = NULL;

2021

1801

size_t interfaces_to_take_down_size = 0;

2022

char run_tempdir[] = "/run/tmp/mandosXXXXXX";

2023

char old_tempdir[] = "/tmp/mandosXXXXXX";

2024

char *tempdir = NULL;

1802

char tempdir[] = "/tmp/mandosXXXXXX";

1803

bool tempdir_created = false;

2025

1804

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

2026

1805

const char *seckey = PATHDIR "/" SECKEY;

2027

1806

const char *pubkey = PATHDIR "/" PUBKEY;

2028

1807

char *interfaces_hooks = NULL;

1808

size_t interfaces_hooks_size = 0;

2029

1809

2030

1810

bool gnutls_initialized = false;

2031

1811

bool gpgme_initialized = false;

2209

1989

/* Work around Debian bug #633582:

2210

1990

<http://bugs.debian.org/633582> */

2211

1991

2212

/* Re-raise privileges */

2213

ret_errno = raise_privileges();

2214

if(ret_errno != 0){

2215

errno = ret_errno;

2216

perror_plus("Failed to raise privileges");

2217

} else {

1992

/* Re-raise priviliges */

1993

if(raise_privileges() == 0){

2218

1994

struct stat st;

2219

1995

2220

1996

if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){

2260

2036

}

2261

2037

2262

2038

/* Lower privileges */

2263

ret_errno = lower_privileges();

2264

if(ret_errno != 0){

2265

errno = ret_errno;

2266

perror_plus("Failed to lower privileges");

2267

}

2039

lower_privileges();

2268

2040

}

2269

2041

}

2270

2042

2294

2066

goto end;

2295

2067

}

2296

2068

memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);

2297

argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');

2298

}

2299

run_network_hooks("start", interfaces_hooks != NULL ?

2300

interfaces_hooks : "", delay);

2069

interfaces_hooks_size = mc.interfaces_size;

2070

argz_stringify(interfaces_hooks, interfaces_hooks_size,

2071

(int)',');

2072

}

2073

if(not run_network_hooks("start", interfaces_hooks != NULL ?

2074

interfaces_hooks : "", delay)){

2075

goto end;

2076

}

2301

2077

}

2302

2078

2303

2079

if(not debug){

2381

2157

2382

2158

/* If no interfaces were specified, make a list */

2383

2159

if(mc.interfaces == NULL){

2384

struct dirent **direntries = NULL;

2160

struct dirent **direntries;

2385

2161

/* Look for any good interfaces */

2386

2162

ret = scandir(sys_class_net, &direntries, good_interface,

2387

2163

alphasort);

2391

2167

ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,

2392

2168

direntries[i]->d_name);

2393

2169

if(ret_errno != 0){

2394

errno = ret_errno;

2395

2170

perror_plus("argz_add");

2396

free(direntries[i]);

2397

2171

continue;

2398

2172

}

2399

2173

if(debug){

2400

2174

fprintf_plus(stderr, "Will use interface \"%s\"\n",

2401

2175

direntries[i]->d_name);

2402

2176

}

2403

free(direntries[i]);

2404

2177

}

2405

2178

free(direntries);

2406

2179

} else {

2407

if(ret == 0){

2408

free(direntries);

2409

}

2180

free(direntries);

2410

2181

fprintf_plus(stderr, "Could not find a network interface\n");

2411

2182

exitcode = EXIT_FAILURE;

2412

2183

goto end;

2435

2206

break;

2436

2207

}

2437

2208

bool interface_was_up = interface_is_up(interface);

2438

errno = bring_up_interface(interface, delay);

2209

ret = bring_up_interface(interface, delay);

2439

2210

if(not interface_was_up){

2440

if(errno != 0){

2211

if(ret != 0){

2212

errno = ret;

2441

2213

perror_plus("Failed to bring up interface");

2442

2214

} else {

2443

errno = argz_add(&interfaces_to_take_down,

2444

&interfaces_to_take_down_size,

2445

interface);

2446

if(errno != 0){

2447

perror_plus("argz_add");

2448

}

2215

ret_errno = argz_add(&interfaces_to_take_down,

2216

&interfaces_to_take_down_size,

2217

interface);

2449

2218

}

2450

2219

}

2451

2220

}

2480

2249

goto end;

2481

2250

}

2482

2251

2483

/* Try /run/tmp before /tmp */

2484

tempdir = mkdtemp(run_tempdir);

2485

if(tempdir == NULL and errno == ENOENT){

2486

if(debug){

2487

fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",

2488

run_tempdir, old_tempdir);

2489

}

2490

tempdir = mkdtemp(old_tempdir);

2491

}

2492

if(tempdir == NULL){

2252

if(mkdtemp(tempdir) == NULL){

2493

2253

perror_plus("mkdtemp");

2494

2254

goto end;

2495

2255

}

2256

tempdir_created = true;

2496

2257

2497

2258

if(quit_now){

2498

2259

goto end;

2573

2334

sleep((unsigned int)retry_interval);

2574

2335

}

2575

2336

2576

if(not quit_now){

2337

if (not quit_now){

2577

2338

exitcode = EXIT_SUCCESS;

2578

2339

}

2579

2340

2634

2395

if(debug){

2635

2396

fprintf_plus(stderr, "Starting Avahi loop search\n");

2636

2397

}

2637

2398

2638

2399

ret = avahi_loop_with_timeout(simple_poll,

2639

2400

(int)(retry_interval * 1000), &mc);

2640

2401

if(debug){

2676

2437

mc.current_server->prev->next = NULL;

2677

2438

while(mc.current_server != NULL){

2678

2439

server *next = mc.current_server->next;

2679

#ifdef __GNUC__

2680

#pragma GCC diagnostic push

2681

#pragma GCC diagnostic ignored "-Wcast-qual"

2682

#endif

2683

free((char *)(mc.current_server->ip));

2684

#ifdef __GNUC__

2685

#pragma GCC diagnostic pop

2686

#endif

2687

2440

free(mc.current_server);

2688

2441

mc.current_server = next;

2689

2442

}

2690

2443

}

2691

2444

2692

/* Re-raise privileges */

2445

/* Re-raise priviliges */

2693

2446

{

2694

ret_errno = raise_privileges();

2695

if(ret_errno != 0){

2696

errno = ret_errno;

2697

perror_plus("Failed to raise privileges");

2698

} else {

2699

2700

/* Run network hooks */

2701

run_network_hooks("stop", interfaces_hooks != NULL ?

2702

interfaces_hooks : "", delay);

2703

2704

/* Take down the network interfaces which were brought up */

2705

{

2706

char *interface = NULL;

2707

while((interface=argz_next(interfaces_to_take_down,

2708

interfaces_to_take_down_size,

2709

interface))){

2710

ret_errno = take_down_interface(interface);

2711

if(ret_errno != 0){

2712

errno = ret_errno;

2713

perror_plus("Failed to take down interface");

2714

}

2715

}

2716

if(debug and (interfaces_to_take_down == NULL)){

2717

fprintf_plus(stderr, "No interfaces needed to be taken"

2718

" down\n");

2719

}

2720

}

2721

}

2722

2723

ret_errno = lower_privileges_permanently();

2724

if(ret_errno != 0){

2725

errno = ret_errno;

2726

perror_plus("Failed to lower privileges permanently");

2727

}

2447

raise_privileges();

2448

2449

/* Run network hooks */

2450

run_network_hooks("stop", interfaces_hooks != NULL ?

2451

interfaces_hooks : "", delay);

2452

2453

/* Take down the network interfaces which were brought up */

2454

{

2455

char *interface = NULL;

2456

while((interface=argz_next(interfaces_to_take_down,

2457

interfaces_to_take_down_size,

2458

interface))){

2459

ret_errno = take_down_interface(interface);

2460

if(ret_errno != 0){

2461

errno = ret_errno;

2462

perror_plus("Failed to take down interface");

2463

}

2464

}

2465

if(debug and (interfaces_to_take_down == NULL)){

2466

fprintf_plus(stderr, "No interfaces needed to be taken"

2467

" down\n");

2468

}

2469

}

2470

2471

lower_privileges_permanently();

2728

2472

}

2729

2473

2730

2474

free(interfaces_to_take_down);

2731

2475

free(interfaces_hooks);

2732

2476

2733

2477

/* Removes the GPGME temp directory and all files inside */

2734

if(tempdir != NULL){

2478

if(tempdir_created){

2735

2479

struct dirent **direntries = NULL;

2736

int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY |

2737

O_NOFOLLOW));

2738

if(tempdir_fd == -1){

2739

perror_plus("open");

2740

} else {

2741

#ifdef __GLIBC__

2742

#if __GLIBC_PREREQ(2, 15)

2743

int numentries = scandirat(tempdir_fd, ".", &direntries,

2744

notdotentries, alphasort);

2745

#else /* not __GLIBC_PREREQ(2, 15) */

2746

int numentries = scandir(tempdir, &direntries, notdotentries,

2747

alphasort);

2748

#endif /* not __GLIBC_PREREQ(2, 15) */

2749

#else /* not __GLIBC__ */

2750

int numentries = scandir(tempdir, &direntries, notdotentries,

2751

alphasort);

2752

#endif /* not __GLIBC__ */

2753

if(numentries >= 0){

2754

for(int i = 0; i < numentries; i++){

2755

ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);

2756

if(ret == -1){

2757

fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"

2758

" \"%s\", 0): %s\n", tempdir,

2759

direntries[i]->d_name, strerror(errno));

2760

}

2761

free(direntries[i]);

2762

}

2763

2764

/* need to clean even if 0 because man page doesn't specify */

2765

free(direntries);

2766

if(numentries == -1){

2767

perror_plus("scandir");

2768

}

2769

ret = rmdir(tempdir);

2770

if(ret == -1 and errno != ENOENT){

2771

perror_plus("rmdir");

2772

}

2480

struct dirent *direntry = NULL;

2481

int numentries = scandir(tempdir, &direntries, notdotentries,

2482

alphasort);

2483

if (numentries > 0){

2484

for(int i = 0; i < numentries; i++){

2485

direntry = direntries[i];

2486

char *fullname = NULL;

2487

ret = asprintf(&fullname, "%s/%s", tempdir,

2488

direntry->d_name);

2489

if(ret < 0){

2490

perror_plus("asprintf");

2491

continue;

2492

}

2493

ret = remove(fullname);

2494

if(ret == -1){

2495

fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,

2496

strerror(errno));

2497

}

2498

free(fullname);

2773

2499

}

2774

TEMP_FAILURE_RETRY(close(tempdir_fd));

2500

}

2501

2502

/* need to clean even if 0 because man page doesn't specify */

2503

free(direntries);

2504

if (numentries == -1){

2505

perror_plus("scandir");

2506

}

2507

ret = rmdir(tempdir);

2508

if(ret == -1 and errno != ENOENT){

2509

perror_plus("rmdir");

2775

2510

}

2776

2511

}

2777

2512